/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
 */
#include <logicalaccess/plugins/crypto/tomcrypt.h>

/**
  @file crypt_register_cipher.c
  Register a cipher, Tom St Denis
  */

/**
   Register a cipher with the descriptor table
   @param cipher   The cipher you wish to register
   @return value >= 0 if successfully added (or already present), -1 if unsuccessful
   */
int register_cipher(const struct ltc_cipher_descriptor *cipher)
{
    int x;

    LTC_ARGCHK(cipher != NULL);

    /* is it already registered? */
    LTC_MUTEX_LOCK(&ltc_cipher_mutex);
    for (x = 0; x < TAB_SIZE; x++)
    {
        if (cipher_descriptor[x].name != nullptr && cipher_descriptor[x].ID == cipher->ID)
        {
            LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
            return x;
        }
    }

    /* find a blank spot */
    for (x = 0; x < TAB_SIZE; x++)
    {
        if (cipher_descriptor[x].name == nullptr)
        {
            XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor));
            LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
            return x;
        }
    }

    /* no spot */
    LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
    return -1;
}

/* $Source$ */
/* $Revision$ */
/* $Date$ */